var obj;
var image_source;

document.getElementById("Enter").onmouseover = function (){
	mouse_action(this, "common/images/top_overlogo.jpg");
}
document.getElementById("Enter").onmouseout = function (){
	mouse_action(this, "common/images/top_logo.jpg");
}




function mouse_action(obj, image_source) {
	obj.setAttribute("src", image_source);
}